n68 1,2,3,4,5,6,7,8; 0,9,10,11,12,13,14,15; 0,9,16,17,18,19,20,21; 0,10,16,22,23,24,25,26; 0,11,17,22,27,28,29,30; 0,12,18,23,27,31,32,33; 0,13,19,24,28,31,34,35; 0,14,20,25,29,32,34,36; 0,15,21,26,30,33,35,36; 1,2,37,38,39,40,41,42; 1,3,42,47,54,55,57,58; 1,4,38,44,47,50,52,56; 1,5,39,43,50,54,59,60; 1,6,40,43,48,49,56,58; 1,7,41,44,45,49,55,59; 1,8,37,45,48,52,57,60; 2,3,37,44,50,53,57,59; 2,4,38,45,51,55,57,61; 2,5,40,46,51,53,54,58; 2,6,39,45,47,52,58,59; 2,7,41,47,50,54,61,62; 2,8,42,44,46,52,55,62; 3,4,37,39,46,52,54,61; 3,5,38,41,56,58,59,61; 3,6,38,42,48,51,52,53; 3,7,43,46,50,51,55,56; 3,8,39,41,43,44,47,48; 4,5,37,41,48,49,50,51; 4,6,39,42,44,49,57,60; 4,7,40,42,45,46,47,48; 4,8,40,41,54,55,56,60; 5,6,37,38,43,44,45,46; 5,7,44,48,53,56,60,62; 5,8,39,40,45,49,61,62; 6,7,37,40,51,59,60,61; 6,8,46,47,53,56,57,61; 7,8,37,42,43,49,53,54; 9,15,16,22,27,31,34,36; 9,11,17,23,24,31,63,64; 9,12,19,22,26,28,33,63; 9,13,18,29,30,33,34,64; 9,14,20,23,26,27,30,65; 9,10,21,24,28,29,36,65; 12,13,25,26,31,36,64,65; 11,14,16,21,26,28,31,32; 14,15,17,19,29,31,33,65; 18,21,22,25,29,31,35,63; 10,11,19,20,26,29,35,64; 13,15,24,26,27,29,32,63; 13,14,27,28,33,36,66,67; 11,12,16,20,25,27,63,66; 17,18,24,25,27,34,65,67; 11,15,19,21,22,24,66,67; 16,18,24,32,35,36,64,66; 10,12,18,20,22,30,36,67; 10,14,17,21,25,30,64,66; 11,13,23,25,30,32,35,67; 10,15,16,17,28,35,63,67; 10,13,18,19,23,63,65,66; 12,14,16,19,23,34,64,67; 12,15,28,30,32,34,65,66; 17,20,22,23,33,34,35,66; 20,21,32,33,63,64,65,67; 38,39,46,48,50,57,58,62; 38,40,43,47,53,55,59,62; 41,42,43,45,51,58,60,62; 49,50,52,53,55,58,60,61; 49,51,52,54,56,57,59,62.